Chapter 16, Problem 16.109QP

Interpretation Introduction

Interpretation:

${\text{Al(OH)}}_{\text{3}}$ is insoluble in water. It dissolves in concentrated $\text{NaOH}$ solution.

A balanced ionic equation for this reaction has to be written

The type of reaction has to be mentioned

Concept Information:

Oxides of metals and non-metals may be,

Acidic-exhibits acidic character

Basic-exhibits basic character

Amphoteric-exhibits both acidic and basic  character

Neutral-does not exhibit any of the acidic or basic character

Metal hydroxides:

Except ${\text{Be(OH)}}_{\text{2}}$, all the alkali and alkaline earth metals are basic.

Hydroxides like  ${\text{Be(OH)}}_{\text{2}},{\text{Sn(OH)}}_{\text{2}},{\text{Pb(OH)}}_{\text{2}}\text{etc}$ are amphoteric.

Most of the amhoteric hydroxides are insoluble except ${\text{Be(OH)}}_{\text{2}}\text{}\text{and}{\text{Al(OH)}}_{\text{3}}$ which reacts with both acids and bases